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Are all bulk pack .22lr subsonic out of pistol barrels?

I use Federal Automatch Bulk Pack for my pistol shooting and it's been pretty good. A lot less issues than with other brands.
Here it is out of an HK Model 4

22/45 w/ AutoMatch and CCI Quiet (which couldn't cycle the bolt)
 
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The point at which a projectile becomes supersonic is approximately 1125fps at sea level at a standard testing temperature of 20C/68F. Altitude and humidity will slightly alter this barrier. When I seek subsonic ammunition to feed my suppressor, I look for published velocities under 1100fps. To answer your question more directly, I find that every bulk pack of .22LR ammunition I have ever purchased was supersonic (NOT subsonic and suppressor friendly).
 
The point at which a projectile becomes supersonic is approximately 1125fps at sea level at a standard testing temperature of 20C/68F. Altitude and humidity will slightly alter this barrier. When I seek subsonic ammunition to feed my suppressor, I look for published velocities under 1100fps. To answer your question more directly, I find that every bulk pack of .22LR ammunition I have ever purchased was supersonic (NOT subsonic and suppressor friendly).

At what barrel length?

My 4.5 inch barrel in my AR22 pistol and my tactical solutions buckmark barrel both keep remington bulk pack subsonic.
 
I've read/hear from quite a few that the bulk pack stuff (most of it's under 1200) will stay subsonic with 4.5" barrels. Much over that, and depending upon weather, specific ammo, and barrel length, it may/may not stay subsonic.

16" barrels you need to purchase subsonic ammo.
 
I can shoot cci velocitors from Walther and it stays subsonic. It's louder than subs but no sonic crack. I'm using a spectre 2
 
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